Heterogeneously integrated,superconducting silicon-photonic platform for measurementdevice-independent quantum key distribution  

作　　者：Xiaodong Zheng Peiyu Zhang Renyou Ge Liangliang Lu Guanglong He Qi Chen Fangchao Qu Labao Zhang Xinlun Cai Yanqing Lu Shining Zhu Peiheng Wu Xiao-Song Ma 

机构地区：[1]Nanjing University,National Laboratory of Solid-state Microstructures,School of Physics,Research Institute of Superconducting Electronics,School of Electronic Science and Engineering,College of Engineering and Applied Sciences,Collaborative Innovation Center of Advanced Microstructures,Nanjing,China [2]Sun Yat-sen University,State Key Laboratory of Optoelectronic Materials and Technologies,School of Electronics and Information Technology,Guangzhou,China

出　　处：《Advanced Photonics》2021年第5期28-35,共8页先进光子学（英文）

基　　金：supported by the National Key Research and Development Program of China(Nos.2017YFA0303704,2019YFA0308700,and 2017YFA0304002);the National Natural Science Foundation of China(Nos.11690032,11321063,and 12033002);the NSFC-BRICS(No.61961146001);the Leading-Edge Technology Program of Jiangsu Natural Science Foundation(No.BK20192001);the Fundamental Research Funds for the Central Universities.

摘　　要：Integrated photonics provides a route to both miniaturization of quantum key distribution(QKD)devices and enhancing their performance.A key element for achieving discrete-variable QKD is a singlephoton detector.It is highly desirable to integrate detectors onto a photonic chip to enable the realization of practical and scalable quantum networks.We realize a heterogeneously integrated,superconducting silicon-photonic chip.Harnessing the unique high-speed feature of our optical waveguide-integrated superconducting detector,we perform the first optimal Bell-state measurement(BSM)of time-bin encoded qubits generated from two independent lasers.The optimal BSM enables an increased key rate of measurement-device-independent QKD(MDI-QKD),which is immune to all attacks against the detection system and hence provides the basis for a QKD network with untrusted relays.Together with the timemultiplexed technique,we have enhanced the sifted key rate by almost one order of magnitude.With a 125-MHz clock rate,we obtain a secure key rate of 6.166 kbps over 24.0 dB loss,which is comparable to the state-of-the-art MDI-QKD experimental results with a GHz clock rate.Combined with integrated QKD transmitters,a scalable,chip-based,and cost-effective QKD network should become realizable in the near future.

关 键 词：quantum key distribution hybrid photonics single-photon detector Bell-state measurement time-multiplexing 

分 类 号：TN918.4[电子电信—通信与信息系统] O413[电子电信—信息与通信工程]